/**
 *
 */
package com.acxiom.bsh.taobao.sdk.kit;

import java.security.MessageDigest;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author luciyu
 *
 */
public class SignatureValidation {

	private static final String KEY = "lop";

	public static SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");


	public static boolean validationSignature(String id, String signature){
		String secret = getSecret(id);
		if (secret!=null&&secret.equals(signature)) {
			return true;
		}
		return false;
	}

	public static String getSecret(String id){
		String date = format.format(new Date());
		StringBuffer signatureKey = new StringBuffer();
		signatureKey.append(id);
		signatureKey.append(date);
		signatureKey.append(KEY);
		return MD5(signatureKey.toString());
	}

	public final static String MD5(String s) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			byte[] btInput = s.getBytes("utf-8");
			// 获得MD5摘要算法的 MessageDigest 对象
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			// 使用指定的字节更新摘要
			mdInst.update(btInput);
			// 获得密文
			byte[] md = mdInst.digest();
			// 把密文转换成十六进制的字符串形式
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}


}
